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Shocking video shows fist fights between the demonstrators in the Martin Luther King Jr Civic Centre Park, which left some bloodied and bruised.

The mayhem ended when cops dressed in riot gear rushed in and separated the two large groups.

Fighting broke out around the city, with one shocking video showing a Trump fan getting singled out and smashed across the head with a skateboard.

The LA Times reports counter-protesters dressed in black, wearing masks and holding signs such as "Fascist USA" tore down a plastic netting that separated the two groups.

Reuters

This pro-Trump supporter was left bloodied after being hit by a counter protester during the Patriots Day Free Speech Rally in Berkeley

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A bloodied protester fixes the plumage of his replica Greek helmet

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A blood stained protester who had attended the rally in California

Reuters

One of the protesters dressed as a Spartan and with the Stars and Stripes as the violence breaks out in California

Reuters

A Pro-Trump demonstrator appears to perform a Nazi salute as they voice their support for the US President

Police had put up the makeshift barrier of plastic orange poles and orange fence mesh to separate both sides, but this quickly came down as demonstrators started punching and kicking each other, while pepper spray and firecrackers were thrown into the crowd.

Trump supporters moved forward with chants of "communists" and waved American flags.

The Berkeley rally, set to include a "picnic and free speech event" had been sponsored by the pro-Trump group Liberty Revival Alliance to counter nationwide protests over the President's refusal to disclose his tax returns.

Getty Images

The alarming image was among several to have emerged following clashes between hundreds of demonstrators in Berkeley

More than a dozen people were arrested as a 'Patriot's Day' free speech event descended into anarchy

Getty Images

Blood pours down the face of another demonstrator at the rally in Berkeley

Getty Images

With a clenched fist. this protester readied for battle in Berkeley

Reuters

Hundreds of people with opposing opinions on President Donald Trump attacked each other, including these two demonstrators

MSNBC

The chaotic scenes when pro and anti-Trump demonstrators clashed in Berkeley today, a number of fights broke out between the warring factions

Carnage as pro and anti-Trump protesters fight at free speech in Berkeley in US

One of the many shocking pictures showed a Trump supporter performing what appeared to be a Nazi salute, while another man waved a knife.

Cops had banned baseball bats, sticks, flag poles and any item that could be used as a weapon in the park beforehand.

Daryl Tempesta, 52, who said he served in the U.S. Air Force near the end of the Cold War, went to the rally to show his support for Trump.

A Trump supporter (L) assists an injured man who was beaten up and left bloodied

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Violence broke out as protests were held nationwide calling for Trump to release his tax records

Reuters

One of the masked counter demonstrators burns the American flag during the tense scenes earlier today

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A man is left bloodied after multiple fights broke out between Trump supporters and counter demonstrators

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A man who appears to be backing Trump gets sprayed in the face during the mayhem which erupted in Berkeley

"As a veteran, I like the track America is on, and that Trump is willing to stand and say we are still America and we are not going to be globalist, we're not going to be a communist country," Tempesta said.

"That's a message I can get behind."

Thousands of protesters have gathered in cities across the United States today to pressure Trump to release his tax returns ahead of the national deadline on Tuesday April 18.

Bekeley, home of one of America's most famous universities, is historically a place where large protests against government have been held.

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This Trump supporter declared he was 'proud' of the controversial so-called Muslim travel ban on his t-shirt

Getty Images

The trouble unfolded when hundreds of Trump opponents staged a counter-rally alongside an event billed as a "Patriots Day" free speech rally and picnic

Reuters

Between 500 and 1,000 people were in park as the rallies peaked, according to an estimate by a Reuters reporter

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Anti-Trump protesters had gathered to demand the release of his tax returns

EPA

A comical chicken-based effigy of Trump paraded outside his tower in New York

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Police removing a yelling protester taking part in the rally in New York

Martin Luther King Jr Civic Centre Park was named after the civil rights giant in 1983 but was previously known as 'Provo Park' during the Vietnam War.

Rival factions have now clashed on the same Berkeley streets twice in the past three months, including in March.